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3^{4}\left(a^{3}\right)^{4}\left(-b\right)^{4}
Expand \left(3a^{3}\left(-b\right)\right)^{4}.
3^{4}a^{12}\left(-b\right)^{4}
To raise a power to another power, multiply the exponents. Multiply 3 and 4 to get 12.
81a^{12}\left(-b\right)^{4}
Calculate 3 to the power of 4 and get 81.
81a^{12}\left(-1\right)^{4}b^{4}
Expand \left(-b\right)^{4}.
81a^{12}\times 1b^{4}
Calculate -1 to the power of 4 and get 1.
81a^{12}b^{4}
Multiply 81 and 1 to get 81.
3^{4}\left(a^{3}\right)^{4}\left(-b\right)^{4}
Expand \left(3a^{3}\left(-b\right)\right)^{4}.
3^{4}a^{12}\left(-b\right)^{4}
To raise a power to another power, multiply the exponents. Multiply 3 and 4 to get 12.
81a^{12}\left(-b\right)^{4}
Calculate 3 to the power of 4 and get 81.
81a^{12}\left(-1\right)^{4}b^{4}
Expand \left(-b\right)^{4}.
81a^{12}\times 1b^{4}
Calculate -1 to the power of 4 and get 1.
81a^{12}b^{4}
Multiply 81 and 1 to get 81.